#include <WiFi.h>
#include <PubSubClient.h>
#define LED 23
// WiFi
const char *ssid = "Wokwi-GUEST"; // Enter your WiFi name
const char *password = ""; // Enter WiFi password
// MQTT Broker
const char *mqtt_broker = "broker.mqtt.cool"; // "broker.emqx.io";
const char *topic = "/UNHAS/Risah";
const char *mqtt_username = "emqx";
const char *mqtt_password = "public";
const int mqtt_port = 1883; // 8884;
const int num = 0;
WiFiClient espClient;
PubSubClient client(espClient);
void turn_on_lamp(){
digitalWrite(LED, HIGH);
Serial.println("Turning on lamp");
}
void turn_off_lamp(){
digitalWrite(LED, LOW);
Serial.println("Turning off lamp");
}
int parseMessage(String message) {
message.toLowerCase(); // Convert message to lowercase for case-insensitive comparison
if (message.indexOf("nyala") != -1) {
return 1; // Lamp on
} else if (message.indexOf("mati") != -1) {
return 0; // Lamp off
} else {
return -1; // Invalid message
}
}
void setup() {
//setup LED
pinMode(LED, OUTPUT);
// Set software serial baud to 115200;
Serial.begin(115200);
// connecting to a WiFi network
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Connecting to WiFi..");
}
Serial.println("Connected to the WiFi network");
//connecting to a mqtt broker
client.setServer(mqtt_broker, mqtt_port);
client.setCallback(callback);
while (!client.connected()) {
String client_id = "esp32-client-"; //clientId-JIbpytZIXX
client_id += String(WiFi.macAddress());
Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str());
if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
Serial.println("Public emqx mqtt broker connected");
} else {
Serial.print("failed with state ");
Serial.print(client.state());
delay(2000);
}
}
// subscribe
client.subscribe(topic);
}
void callback(char *topic, byte *payload, unsigned int length) {
Serial.print("Message arrived in topic: ");
Serial.println(topic);
Serial.print("Message:");
String message;
for (int i = 0; i < length; i++) {
message += (char)payload[i];
}
controlLamp(parseMessage(message));
Serial.println("-----------------------");
}
void loop() {
// put your main code here, to run repeatedly:
client.loop();
}